Question

How many gram of 90% Na2SO4 can be produced from 250gram of 95% pure NaCl

Answer 1

250gram of 95% pure NaCl contains:

= 95/100 x 250

= 237.5 g of pure sodium

If 90%  = 237.5 G

What about 100%

100% = 100/90 x 237.5

         = 263.89 g


250 gram of 95% pure NaCl can produce 263.89g of 90% pure NaCl

Answer 2

250x95/100 gm of Nacl = 4.05 mol of Nacl

= 4.05 mol of Na2SO4= !/2x4.05x142x100/90 g Na2SO4 or

320g of Na2So4